Boston Marathon logo
BOSTON MARATHON 2023

Ken Heisz

Bib: 21151•M

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M65-69)
#0 / 549
Top 47%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:31/mi
26:27
↑ 97↓ 3451.5%
10K· 6.21 mi
8:39/mi
53:20
↑ 79↓ 1380.4%
15K· 9.32 mi
8:50/mi
1:20:47
↑ 67↓ 78
20K· 12.43 mi
9:00/mi
1:48:45
↑ 106↓ 860.1%
Half· 13.11 mi
9:08/mi
1:54:59
↑ 19↓ 370.5%
25K· 15.53 mi
9:15/mi
2:17:24
↑ 66↓ 880.2%
30K· 18.64 mi
9:37/mi
2:47:18
↑ 181↓ 1480.2%
20M
9:44/mi
3:00:31
↑ 64↓ 500.2%
21M
10:23/mi
3:10:54
↑ 106↓ 241.6%
35K· 21.75 mi
9:37/mi
3:18:06
↑ 17↓ 861.7%
23M
9:47/mi
3:30:21
↑ 23↓ 630.6%
24M
9:28/mi
3:39:49
↓ 821.3%
40K· 24.85 mi
9:51/mi
3:48:14
↓ 200.3%
25.2M
10:29/mi
3:51:51
↑ 13↓ 160.2%
Finish· 26.22 mi
9:27/mi
4:01:29
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:59
Pace8:46 /mi
2nd Half
Distance13.11 mi
Time2:06:30
Pace9:39 /mi
📊Positive Split: 10.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:5826:278:3126:27
8:31
-
10K
6.21 mi11:48:5153:208:3526:53
8:39
+0:08
15K
9.32 mi12:16:181:20:478:4027:27
8:50
+0:11
20K
12.43 mi12:44:161:48:458:4527:58
9:00
+0:10
Half
13.11 mi12:50:301:54:598:466:14
9:08
+0:08
25K
15.53 mi13:12:552:17:248:5122:25
9:15
+0:07
30K
18.64 mi13:42:492:47:188:5829:54
9:37
+0:22
20M
20.00 mi13:56:023:00:319:0213:13
9:44
+0:07
21M
21.00 mi14:06:253:10:549:0510:23
10:23
+0:39
35K
21.75 mi14:13:373:18:069:077:12
9:37
-0:46
23M
23.00 mi14:25:523:30:219:0912:15
9:47
+0:10
24M
24.00 mi14:35:203:39:499:109:28
9:28
-0:19
40K
24.85 mi14:43:453:48:149:118:25
9:51
+0:23
25.2M
25.20 mi14:47:223:51:519:123:37
10:29
+0:38
Finish
26.22 mi14:57:004:01:299:139:38
9:27
-1:02

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

8:31 /mi

Average Pace

9:13 /mi

Slowest Pace

10:29 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:59

48% of race

Time at Steady Pace

1:31:50

38% of race

Time at Slower Pace

34:40

14% of race

Average Pace: 9:13 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:21:5826:278:3126:27
8:31
#17640
10K
6.21 mi11:48:5153:208:3526:53
8:39
#18427
15K
9.32 mi12:16:181:20:478:4027:27
8:50
#18851
20K
12.43 mi12:44:161:48:458:4527:58
9:00
#19068
Half
13.11 mi12:50:301:54:598:466:14
9:08
#19177
25K
15.53 mi13:12:552:17:248:5122:25
9:15
#19331
30K
18.64 mi13:42:492:47:188:5829:54
9:37
#19472
20M
20.00 mi13:56:023:00:319:0213:13
9:44
#19481
21M
21.00 mi14:06:253:10:549:0510:23
10:23
#19468
35K
21.75 mi14:13:373:18:069:077:12
9:37
#19504
23M
23.00 mi14:25:523:30:219:0912:15
9:47
#19509
24M
24.00 mi14:35:203:39:499:109:28
9:28
#19501
40K
24.85 mi14:43:453:48:149:118:25
9:51
#19509
25.2M
25.20 mi14:47:223:51:519:123:37
10:29
#19513
Finish
26.22 mi14:57:004:01:299:139:38
9:27
#19540
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM65-69Seg. OverallSeg. MalesSeg. M65-69
5K3.11 mi3.11 mi17640112861128619696(Top 74%)12171(Top 80%)12171(Top 2217%)
10K6.21 mi3.10 mi18427-78711630-34411630-34419138(Top 72%)11953(Top 79%)11953(Top 2177%)
15K9.32 mi3.11 mi18851-42411793-16311793-16319696(Top 74%)12171(Top 80%)12171(Top 2217%)
20K12.43 mi3.11 mi19068-21711892-9911892-9919703(Top 74%)12183(Top 80%)12183(Top 2219%)
Half13.11 mi0.68 mi19177-10911936-4411936-4420924(Top 79%)12692(Top 84%)12692(Top 2312%)
25K15.53 mi2.42 mi19331-15411988-5211988-5220002(Top 75%)12289(Top 81%)12289(Top 2238%)
30K18.64 mi3.11 mi19472-14112041-5312041-5319873(Top 75%)12156(Top 80%)12156(Top 2214%)
20M20.00 mi1.36 mi19481-912021+2012021+2019620(Top 74%)11951(Top 79%)11951(Top 2177%)
21M21.00 mi1.00 mi19468+1312005+1612005+1619221(Top 72%)11729(Top 77%)11729(Top 2136%)
35K21.75 mi0.75 mi19504-3612019-1412019-1420204(Top 76%)12127(Top 80%)12127(Top 2209%)
23M23.00 mi1.25 mi19509-512015+412015+419376(Top 73%)11734(Top 77%)11734(Top 2137%)
24M24.00 mi1.00 mi19501+811996+1911996+1919095(Top 72%)11576(Top 76%)11576(Top 2109%)
40K24.85 mi0.85 mi19509-811994+211994+219511(Top 73%)11711(Top 77%)11711(Top 2133%)
25.2M25.20 mi0.35 mi19513-411991+311991+319037(Top 72%)11493(Top 76%)11493(Top 2093%)
Finish26.22 mi1.02 mi19540-2711992-111992-119947(Top 75%)11958(Top 79%)11958(Top 2178%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 74%
×21story building
+97ft-345ft

Overall

19696

Males

12171

M65-69

12171

5K→10K

3.1 - 6.2 mi

Top 72%
×5story building
+79ft-138ft

Overall

19138

Males

11953

M65-69

11953

10K→15K

6.2 - 9.3 mi

Top 74%
×3story building
+67ft-78ft

Overall

19696

Males

12171

M65-69

12171

15K→20K

9.3 - 12.4 mi

Top 74%
×5story building
+106ft-86ft

Overall

19703

Males

12183

M65-69

12183

20K→Half

12.4 - 13.1 mi

Top 79%
×2story building
+19ft-37ft

Overall

20924

Males

12692

M65-69

12692

Half→25K

13.1 - 15.5 mi

Top 75%
×4story building
+66ft-88ft

Overall

20002

Males

12289

M65-69

12289

25K→30K

15.5 - 18.6 mi

Top 75%
×9story building
+181ft-148ft

Overall

19873

Males

12156

M65-69

12156

30K→20M

18.6 - 20.0 mi

Top 74%
×5story building
+64ft-50ft

Overall

19620

Males

11951

M65-69

11951

20M→21M

20.0 - 21.0 mi

Top 72%
×8story building
+106ft-24ft

Overall

19221

Males

11729

M65-69

11729

21M→35K

21.0 - 21.8 mi

Top 76%
×7story building
+17ft-86ft

Overall

20204

Males

12127

M65-69

12127

35K→23M

21.8 - 23.0 mi

Top 73%
×5story building
+23ft-63ft

Overall

19376

Males

11734

M65-69

11734

23M→24M

23.0 - 24.0 mi

Top 72%
×6story building
+12ft-82ft

Overall

19095

Males

11576

M65-69

11576

24M→40K

24.0 - 24.9 mi

Top 73%
×1story
+6ft-20ft

Overall

19511

Males

11711

M65-69

11711

40K→25.2M

24.9 - 25.2 mi

Top 72%
×1story
+13ft-16ft

Overall

19037

Males

11493

M65-69

11493

25.2M→Finish

25.2 - 26.2 mi

Top 75%
×2story building
+22ft-21ft

Overall

19947

Males

11958

M65-69

11958

Passing Analysis

Category:
Athletes Passed
861
Passed By
2761
Net Change
-1900
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17640
5K → 10K79866-787#17640#18427
10K → 15K63487-424#18427#18851
15K → 20K98315-217#18851#19068
20K → Half7116-109#19068#19177
Half → 25K79233-154#19177#19331
25K → 30K116257-141#19331#19472
30K → 20M7887-9#19472#19481
20M → 21M8370+13#19481#19468
21M → 35K3470-36#19468#19504
35K → 23M7176-5#19504#19509
23M → 24M5850+8#19509#19501
24M → 40K4755-8#19501#19509
40K → 25.2M1418-4#19509#19513
25.2M → Finish3461-27#19513#19540
TOTALS8612761-1900
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing